body {
  background: red;
}
.less-box-1 {
  width: 100px;
  height: 100px;
  background: red;
}
.less-box-2 {
  width: 200px;
  height: 200px;
  background: red;
}
.less-box-3 {
  width: 300px;
  height: 300px;
  background: red;
}
